Using scan name in tns file not working at client side...

Hi All,
I have installed 2 node RAC -11gR2 on ORACLE VM Server 2.2.1.
now, I want to give tnsentry to dev team to use this RACDB.
I am using scan name in tnsnames.ora file. Also I have make scan name entry in /etc/hosts not in the DNS.
I have below entry in RACDB server...
RACDB =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = RWCORA-cluster-scan)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = racdb)
== now in dev user side, If I give the same above tns entry and make entry of this scan name and two VIPs in /etc/hosts file of dev user then SQL*Plus is successfully connected but not JDBC like SQL*Developer.
I have make below entry in dev user's /etc/hosts file:
10.40.0.51 RWCORARAC1-vip
10.40.0.52 RWCORARAC2-vip
10.40.0.50 RWCORA-cluster-scan
Is this correct way or suggest me perfect link through which I canconnect all OCI, JDBC connection from client side.
Thanks...

you can use JDBC thin URL in SQL developer.
Choose NEW/DATABASE CONNECTION, then put the connection type "Advanced" and then place the jdbc url as :
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=RWCORA-cluster-scan)(PORT=1521))(LOAD_BALANCE=yes)(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=racdb)(FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)(RETRIES=180)(DELAY=5))))

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